Shure UC2 Hand-Held UHF Transmitter
20
Service Procedures
25A1044 (RI)
Deviation Reference Voltage: Using a Modified SC4 IF Receiver
.
Deviation tests can also be performed using a modified SC4 IF
receiver. For instructions on modifying an SC4 receiver, consult the
Shure
Service Equipment manual.
RF SIGNAL GENERATOR
AUDIO ANALYZER
DC BLOCK
NOTE: DC VOLTAGES ARE
PRESENT AT MOST RF TEST
POINTS. USE A DC BLOCK
ON THE RF SIGNAL GENERATOR
TO PROTECT TEST EQUIPMENT.
R
I
L
ZAD–1 MIXER
MODIFIED SC4 IF RECEIVER
ANTENNA INPUT B
AUDIO OUT
TONE KEY SWITCH: OFF
SC4 IF Receiver
Audio Analyzer
Rf Signal Generator
Output: Unbalanced
Measurement: AC level
INT: FM
Gain: Maximum
Filters:
INT: 1 kHz
Squelch: Mid
Low-Pass (30 kHz): ON
Output amplitude: + 7 dBm
Tone Key switch: OFF
High-Pass (400 Hz): ON
Frequency: 10.7 MHz
Operating freq: See Table 2
Modulation:
See Table 2
Figure 12.
Deviation Reference Voltage Test Set-Up,
Using a Modified SC4 IF Receiver
1. See Figure 12 for equipment test set-up and equipment settings.
2. Connect the rf signal generator output to the input port (L) of a
Zad-1 mixer
3. Connect the output port I (intermediate frequency) of the Zad–1
mixer to antenna input B of the SC4 IF receiver.
4. Turn the SC4 IF receiver ON and set the tone key switch on the
front panel of the SC4 IF receiver to OFF.
5. Connect the audio voltmeter to the receiver’s unbalanced output.
6. Measure the output voltage.
Record this voltage. This is the
deviation reference voltage.
Use the same Zad-1 mixer connections for the next adjustment test.
